import re
pattern = r"mr_\w+"
string = "MR_SHOP mr_shop"
match = re.match(pattern, string, re.I)
print("匹配值的起始位置：", match.start())
print("匹配值的结束位置：", match.end())
print("匹配位置的元组：", match.span())
print("要匹配的字符串：", match.string)
print("匹配的数据：", match.group())